docs: def get_nic_mtu(nic):
      """Return the Maximum Transmission Unit (MTU) for a network interface."""
      cmd = ['ip', 'addr', 'show', nic]
      ip_output = subprocess.check_output(cmd).decode('UTF-8').split('\n')
      mtu = ""
      for line in ip_output:
          words = line.split()
          if 'mtu' in words:
              mtu = words[words.index("mtu") + 1]
      return mtu